But Robertson, like many other wealthy New Yorkers, has painstakingly avoided paying that bill.

How?

The city deems you a resident only if you reside in the city for more than 182 days.

So Robertson and his cohort maintain assistants to track "NYC" and "non-NYC" days, and drivers and private jets to whisk them away at the drop of a hat if they come close to their yearly limit, Stewart writes.

"Friday nights were particularly risky," Stewart writes, "since Robertson or his wife often had social events scheduled in the city. In order to 'earn a tax day,' as he put it, he usually left town on Friday before midnight, even if his wife stayed at the apartment...As long as they crossed the Queens border [to a second home] by midnight, Robertson didn't have to 'waste' a Saturday as a New York day."